Focus rectangle / box
Slap on a quad to display selection of a unit, etc. or simply draw a rectangle.
Shader code
shader_type spatial;
render_mode unshaded, cull_disabled, depth_draw_opaque;
uniform float size;
uniform float width;
uniform vec4 inner_color: hint_color;
uniform vec4 outer_color: hint_color;
void fragment() {
ALPHA = 0.0;
vec2 uv = vec2(
abs(UV.x - 0.5) * 2.0,
abs(UV.y - 0.5) * 2.0
);
float min_size = size - width;
if ((uv.x > min_size || uv.y > min_size) && (uv.x < size && uv.y < size)) {
vec4 color = mix(inner_color, outer_color, max(uv.x - min_size, uv.y - min_size) / width);
ALPHA = color.a;
ALBEDO = color.rgb;
}
}
